Environmental problems

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  • Publicado : 17 de março de 2013
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Index

Conteúdo
Introduction 2
Environmental Problems 3
Global Warming 4
Species Extinction 6
Water Crisis 8
Deforestation 10
Nuclear Fallout 13
How Green am I? 15
Do’s and Don’ts 16
Conclusion 17

Introduction
Nowadays we live with several environmental problems and we must start to worry about it.
If we think in ourplanet 50 years ago, we see that none of those problems were talked. But now, with the globalization and the continuous natural process of the earth, it becomes imperative to think about solutions for this problems and mostly important, start to act, instead of thinking and give advices.
In this document, i’ll make a research to explain what the environmental problems are, give some examples, andtalk about causes, consequences and possible solutions.

Environmental Problems
I’ve made a selection about the environmental problems I believe it’s necessary to talk about:
* Global Warming
* Species Extinction
* Water Crisis
* Deforestation
* Nuclear Fallout
Next, I’ll talk about each environmental problems, describing them, explaining causes and consequences and givesome possible solutions.

Global Warming

What is Global Warming?
Global Warming is the increase of Earth's average surface temperature due to effect of greenhouse gases, such as carbon dioxide emissions from burning fossil fuels or from deforestation, which trap heat that would otherwise escape from Earth.
Earth's climate is mostly influenced by the first 6 miles or so of the atmospherewhich contains most of the matter making up the atmosphere.

Causes
The only way to explain the pattern is to include the effect of greenhouse gases (GHGs) emitted by humans.
One of the first things scientists learned is that there are several greenhouse gases responsible for warming, and humans emit them in a variety of ways. Most come from the combustion of fossil fuels in cars, factories andelectricity production. The gas responsible for the most warming is carbon dioxide, also called CO2. Other contributors include methane released from landfills and agriculture (especially from the digestive systems of grazing animals), nitrous oxide from fertilizers, gases used for refrigeration and industrial processes, and the loss of forests that would otherwise store CO2.

Consequences
Theplanet is warming, from North Pole to South Pole, and everywhere in between. Globally, the mercury is already up more than 1 degree Fahrenheit (0.8 degree Celsius), and even more in sensitive Polar Regions. And the effects of rising temperatures aren’t waiting for some far-flung future. They’re happening right now. Signs are appearing all over, and some of them are surprising. The heat is notonly melting glaciers and sea ice, it’s also shifting precipitation patterns and setting animals on the move.
Some impacts from increasing temperatures are already happening:
* Ice is melting worldwide, especially at the Earth’s poles. This includes mountain glaciers, ice sheets covering West Antarctica and Greenland, and Arctic sea ice.
* Researcher Bill Fraser has tracked the decline ofthe Adélie penguins on Antarctica, where their numbers have fallen from 32,000 breeding pairs to 11,000 in 30 years.
* Sea level rise became faster over the last century.
* Some butterflies, foxes, and alpine plants have moved farther north or to higher, cooler areas.
* Precipitation (rain and snowfall) has increased across the globe, on average.
* Spruce bark beetles have boomed inAlaska thanks to 20 years of warm summers. The insects have chewed up 4 million acres of spruce trees.

Possible Solutions
A commonly cited goal is to stabilize GHG concentrations around 450-550 parts per million (ppm), or about twice pre-industrial levels. This is the point at which many believe the most damaging impacts of climate change can be avoided.  Current concentrations are about 380...
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